Figure P6.34-1 shows an impulse response h[n], specified as
a) Determine a choice for h1[n] and h2[n] such that
h[n] = h1[n] ∗ h2[n],
where h1[n] is an FIR filter and where h2[n] = 0 for n/4 not an integer. Is h2[n] an FIR or IIR filter?
(b) The impulse response h[n] is to be used in a downsampling system as indicated in Figure P6.34-2.
Draw a flow graph implementation of the system in Figure P6.34-2 that requires the minimum number of nonzero and nonunity coefficient multipliers. You may use unit delay elements, coefficient multipliers, adders and compressors. (Multiplication by a zero or a one does not require a multiplier.)
(c) For your system, state how many multiplications per input sample and per output sample are required, giving a brief explanation.
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